apex/up

// Package proxy provides API Gateway and Lambda interoperability.
package proxy

import (
    "encoding/json"
    "net/http"

    "github.com/apex/go-apex"
    "github.com/pkg/errors"
)

// NewHandler returns an apex.Handler.
func NewHandler(h http.Handler) apex.Handler {
    return apex.HandlerFunc(func(event json.RawMessage, ctx *apex.Context) (interface{}, error) {
        e := new(Input)

        err := json.Unmarshal(event, e)
        if err != nil {
            return nil, errors.Wrap(err, "parsing proxy event")
        }

        req, err := NewRequest(e)
        if err != nil {
            return nil, errors.Wrap(err, "creating new request from event")
        }

        res := NewResponse()
        h.ServeHTTP(res, req)
        return res.End(), nil
    })
}